Performance of 3rd Generation Locally Available Chemical Admixtures in the Production of SCC

M. Yousaf, Z.A. Siddiqi, B. Sharif, A. H. Khan


Increasing trend in urbanization and industrialization has necessitated production of high rise buildings with an innovation to make an optimized use of reduced available land in thickly populated areas, which is not possible by standard conventional concrete. Such a different concrete can be created only through different types of admixtures, which when added at various stages of concrete production yield required properties without scarifying the durability and economy of the structure. A proper mix design of self-compacting concrete (SCC) gives improved properties required in fresh state as well as in hardened state thus enhancing the durability of the structure through good bonding between concrete and steel apart from other factors. Present paper gives an outline of the fundamental rheological properties such as flow-ability, passing-ability and stability of self -compacting concrete in fresh state using variety of the locally available chemical admixtures related to 1st, 2nd and 3 rdgenerations from various chemicals supplying outlets. ASTM-test methods along with ACI, EFNARC and RILEM specifications and guidelines were followed throughout the experimentation process. It was observed that 3rd generation chemical admixtures gave better performance compared to 1 st and 2nd generation admixtures. Flow-ability and passing-ability for the produced concrete were found to be improved by an average of more than 25%. SCC produced was highly stable showing improvement in compressive strength by average of 30%. All this can be attributed to the long chain molecular structure of the Poly-Carboxylate Ether (PCE)in 3rd generation chemical admixtures helping produce highly fluid yet a stable concrete.

Full Text:



Okamura H and Ozawa K. “Self- compacting high performance concrete” International workshop on high performance concrete” Detroit:ACI 1994; pp 31-44.

Khayat, K. H., “Viscosity-enhancing admixtures for cement based materials; an overview” Elsevier journal of Cement and Concrete, 1998; pp171 -187.

P. L. Domone. “Self-compacting concrete; an analysis of 11 years of case studies,” Journal of cement and concrete composites, 2006;pp 197- 208.

M. Collepardi. “The world of chemical admixtures in concrete”, Proceedings of the congress “our world in concrete and structures”, Singapore, 1993;pp 63-72.

M. Collepardi, “Admixtures used to enhance placing characteristics of concrete,” Cement and concrete composites, 1998; pp 103-112.

Andreas Griesser; “Cement-superplasticizer interaction at ambient temperatures,” Ph.D Thesis, Swiss federal institute of technology, Zurich 2002;pp 23-29.

Peter Billberg. “Factors affecting workability and rheology of concrete,” ACI fall convention Louisiana U.S.A; 2009.

P. K. Mehta, “Durability- critical issues for the future” Concrete international, july 1997;pp. 27-33.

Joseph A. Daczko and Martin Vachon. “Self consolidating concrete”, ASTM-STP169D, 2006;pp 637-645.

S. Collepardi, L. Coppola, R. Troli, and M. Collepardi, “Mechanism of actions of different superplasticizers for high performance concrete”. SP 186-29,1994;pp 503-523.

Sakai and Domain. “Mechanism of superplastification”, Materials science of concrete (iv), The American ceramic society, Westerville, USA 1995;pp 91-111

RILEM final report,“Casting of selfcompacting concrete” TC188-CSC, 2006;pp937-954

ACI report 237R-07, “Self consolidating concrete,” report by ACI committee 237, 2007; pp 1-30.

EFNARC guidelines05, “The European guide lines for self -compacting concrete,” 2005;pp 1-63.

Kamal Khayat and AichaGhazal, “Effect of viscosity modifying admixture-superplasticizer combination on flow properties of SCC equivalent mortar,” 3rd international symposium on self-compacting concrete, August 2003; Iceland,pp 369-377.

J. Cheung. et. al “Impact of admixtures on the hydration kinetics of Portland cement,” Cement and concrete research 41, 2011; pp 1289-1309.

Etsuo, “Molecular structure and dispersion-adoption mechanisms of comb-type superplasticizer used in Japan,” Journal of advanced concrete technology vol.1, 2003, pp 16-25.

Changwen Miao, “Influence of polycarboxylate based superplasticizer on the microstrcuture of concrete” 1st international conference on microstructure related durability of cementitious composites” 13-15 October, Nanjing, China 2008, pp. 667-669.

Shazimet. Al, “ Utilization of rice husk ash as viscosity modifying agent in self compacting concrete,” Elsevier journal of construction and materials 25, 2011 pp. 1044-1048

Saeedahmad, “ Production and effects of SCC on various properties of concrete,” 31st conference on “ our world in concrete and strcutures” Singapore, August 2006.

Syed Ali Rizwan, “ Self compacting concrete, a useful technology” Pakistan Engineering Congress, 70th annual session proceedings. pp.294-317

Copyright (c) 2016 M. Yousaf

Powered By KICS